Lecture with formulas on the blackboard in front of studentsLecture with formulas on the blackboard in front of students
A gray block of rock on the shore, against the background of a lilac skyA gray block of rock on the shore, against the background of a lilac sky
A field of pink cosmos on the background of mountains and cloudsA field of pink cosmos on the background of mountains and clouds
Church on the background of blue sky and mountainsChurch on the background of blue sky and mountains